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The Façade Pattern
As your programs evolve and develop, they frequently grow in complexity. In fact, for all the excitement about using design patterns, these patterns sometimes generate so many classes that it is difficult to understand the program’s flow. Furthermore, there may be a number of complicated subsystems, each of which has its own complex interface.
The Façade pattern enables you to simplify this complexity by providing a simplified interface to these subsystems. This simplification may in some cases reduce the flexibility of the underlying classes, but it usually still provides all the function needed for all but the most sophisticated users. These users can still, of course, access the underlying classes and methods.
Fortunately, ...
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